Session Variables???

I'm creating a class to hold session variables. I'm pretty new to jsp so I'll most likely be posting several questions. My question right now is "What" types of information should I store for session variables?

So far I have

user
password
admin flag
last url

I feel that I'm not tracking enough (although, I am trying to keep it as simple as possible)

Could anyone offer advice.

Points are low so that I can hand out more if necessary. If not necessar, I'll up the points.

If you have af jsp with some form-elements that you know you will return to later, it will be a good idea to store these forms in session.

Fx. If you have a Calendar page-and have selected OCTOBER 2004, then you want to do something else (change content of a date), and return to the form.
In this case you could store the selections in session, and when you return to the page reload them.

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The session is on a per user basis. It stores name-value pairs, like a Hashmap. You can store just about anything (small). Everyone gets their own session. In the old day though, it was possible to get a collection of ALL the active sessions on the server, a major security risk (depending on how the session were being used). The javadoc for HttpSession interface still lists the old put/get Value, put being an indication of HttpSession's hash-map roots.

Like I said, i'm pretty new to this. One of the things I want the session to do is determine if a user has signed in via an html form. If a user bookmarks a page that needs signing in to, I want to redirect the user to the index page. Here's some code:

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